Steam-boiler.



PATENTED MAY 3l, l1904'.

A. .0. EVANS.

' STEAM BOILER. APPLIOATION FILED lun. ze. 190i.

\ N0 MODEL.

Nvo. 761,462. f PATBNTED MAY s1, 1904.

' A. o. EVANS.

STEAM BOILBR.

APPLICATION :FILED MAR. 26. 1901.

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No. 761,462. PATBNTBD MAY s1, 1904.

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` lSTLMM-BOILBR.

I APPLICATION FILED MAIE-l 26, 1901.y

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W-nes'sesf 11m. mm2. A PATENITREMM 31, 1904.- A. c. EVANS.

STEAM BOILBR. ArrLIoATIoN FILED 11.13.26. 1901.' 1m mum.. v @simu-SHEET 4.-.

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Patented 'May 31, 1904.

"UNITED STATES PATENT l OFFICE.

ALFRED O. EvANs, on NORFOLK, vrRGINIA.

STEMQ-BOILER. 1

sBEcIFicA'rIoN forming paia or-Ltars PatentNo. 761,4eauated Mayen- 1904. i., Application filed March ze, 190i; srin No. 52,994. (N6 model.)

Tall-whom tm/wy con/cern.-

Beit. known that I, ALFRED CLINTON EVANS, A a citizen ofthe United States, and a resident. of Norfolk, in the county of Norfolk and State of Virginia, have made a certain new and useful Invention in Steam-Boilers; and I declare thev following to'b'e a full, clear, and exact descrip-i` f tion of,` the same,'such as will enabl'eotliers"v `skilled the art to. which it appertains toi make and use the invention, reference v beingl l`hadto the accompany-ing drawings, and to letl'tersiofreferencemarked thereon, which form ,a part-.of thisspeciiication. y e f' This inventionphas'relation tosteam-boilers,

and has for its object the "provision, inv Vcombinationwith areturn-iiue boiler, of a water? 'tube lining or'inclosurezfor the combustion- .chamber;` in combination with' a feed-water, lheaterian'd in connection vwith certain other features hereinafter described, for the purpose r ofobtaining the maximum amount of steam generation from a minimum" amount of fuel,' atthe same tunel provlding for durability in all Vparts'vof the boiler and with but little in creased weight-, l v t With this object kin view the invention conlsi-sts inthe novel construction and combination of parts, all 'as hereinafter described, and

i -pointedout in the appended-'claims'. 3.

afront elevation of the invention. Fig.f2 Yisi 'af top plan view of the same.'-' Fig. 3 isa'sec- "tion on the line 3 3,'Fig. 1.

tubes and manifolds.

:In the-accompanying drawings, Figure 1 is Fig. 4 is a'section on the line 4 4:, Fig. 3; and Fig.4 5 is a' detail sectional view of the-connection of Water- `Referring to the drawings, theletter'A des-v -ignates the water-drums, of whichtwo are shown arranged side by slde, having a common :water clrculation, steam-drum, and' smokepipe and having return llire-tubes ct (t, and B1B are the separate fire'k or combustion chambersr extending underneath .said drums and comy .municatingwith said tubes through the up;

takes at the rear, the accessories of such boilers being of the usual character common toi return-Hue boilers having the {ire-bridges b, grates b', &c. At each side of each irecham` ber, underneath the drums and extending the; full length thereof from the front Wall of the furnace pastthe lire-bridge and arrangedat each side also of the uptakes to the rear Wall .of the furnace, are the continuous double lines ofwater-tubes C ,C of a staggered or breakjoint arrangement, suohtubes extending likewise the full height of the firechambers and uptakes and forming, inveifect, not only a Wfrheatingsurface of the maximumextent, but also effectively protecting the inner lining of the combustion-chamber from injury from excessive heat, :these tubes being intermediately of their height .offset or bent inwardlyin va vertical plane to conform in curvature to the lower halves of the waterfdrumfs, to which they closelyapproach, and to forman inclosing arch overthe fire-chambers, the resultant Acurvatures being all .of a continuous down- -ward direction and avoiding the horizontal, so

as to prevent accumulation f mud, &c.

D 'D are bottom longitudinal manifoldsarranged at the bottom of the furnace underneath said Vlines of tubes and to which the fourwayYejoints d d are connected by( suitable union-couplings d, the vertical lines of tubes being connected in groups 'of four to each -said Yj'oint by right and left threaded sleeves cti2 in such manner as to inolose and guard the threads'of the joints from .injury by the flames,

which injury is further avoidedby the location of'said sleeves on a Vlevel with the kgratebars'or' the coolest part f the fire.V

vloustionichamber and extendingthe full height thereof and of the uptakes yat the rear, such tubes'fbeing arched or bent forwardly at their "urine vthe uptak'es and to bring such tubes in registerf with the upper cross-manifold hereinafter nportions to form a roof orA cover over described, with which said tubes are lconnected in groups of fou'r by means of right and left threaded sleeves, four-way Y-joints, and unioncouplings, as hereinbefore described.

E E are cross-manifolds at top and bottom ofthe furnace and Vat the rear of the same,

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the lower said manifold being on a level with the lower longitudinal manifolds, with which it has a free communication through suitable joints, and the upper said manifold being located somewhat above the longitudinal upper manifolds, with which it has also a free communication through suitable joints, said upper cross-manifold having also a communication with the interior of the water-drums at the top thereof by downwardly-extending elbows ff.

Downflow-pipes G G communicate with the lower forward part of the boiler-drums, such pipes being extended laterally and downwardly at the outer sides of the drums to com- `m'unicate with the lower longitudinal manifolds. Such pipes G are also extended laterally at the inner sides of the water-drums and are united, the water-gage being connected with such inner lateral pipe extensions.

The extremities of the manifolds have suit- -able caps or plugs, which may be removed for cleaning purposes. The upper and lower central longitudinal manifolds D and E are common to the inner lines of pipes C C of both furnaces, a double arrangement of Y-joints, &c., being employed for this purpose.

All of the upper manifolds and the upper portions of the tubes C and F communicating therewith form an extension or supplementary steam-space of the water-drums, while the balance of said tubes and the lower manifolds form an extension or 'supplementary waterspaee of said drums.

My union-couplings consist of the two sections of pipeY Y, having a threaded connection each with one of the four-way Y-joints and a similar connection with the manifold. One of said sections Y is outwardly fianged at its inner extremity and threaded upon said flange for engagement with the couplingsleeve Z, having an inwardly-extending annular flange or collar e, engaging an inwardlyextending annular flange y at the inner end of the other said section Y, whereby upon turning said coupling-sleeve the two sections Y Y -are drawn together, a suitable packing being arranged between their abutting ends.

-lines of tubes arranged adjacent to the side walls of the combustion-chamber and inside of the swells of the lines of water-tubes C C and communicating at their extremities to form acoil at each side of the furnace, the top members of such coils being extended upwardly at their rear ends and then forwardly to connect with the interior of the boiler-drums and the lower members of said coils being extended forwardly through the forward wall of the furnace and then laterally and upwardly to connect with the feed-water pump.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

l. In a return-flue steam-boiler, the watertubes inclosing the combustion-chamber bclow the water-drum, and having an inward extension or offset over said chamber, and the water-tubes inclosing the uptake at the rear of said drum, and having an inward extension or offset over the said uptake, substantially as specified.

2. In a return-flue steam-boiler, the two lines of water-tubes, having a break-joint arrangement, and inclosing the combustionchamber thereof, and having an inward extension over said chamber to form a cover therefor, substantially as specified.

3. In a return-Hue steam-boiler, the watertubes inclosing the combustion-chamber below the water-drum, and having an inward extension or offset over said chamber to form a roof or cover therefor, and the feed-water tubes at the sides of said chamber, and lying within the offset portions or inward extensions of said first named tubes, substantially as specified.

4. In a return-flue steam-boiler, the upper and lower longitudinal manifolds, the vertical water-tubes connected to said manifolds at top and bottom, and lining the sides of the combustion-chamber below the water-drum, and the sides of the uptake at the rear thereof, the upper and lower cross-manifolds, the vertical water-tubes lining the rear of said chamber, and of said uptake, and connected to said cross-manifolds at top and bottom, and the downiow-pipe connecting the lower forward portion of the boiler-drum with said lower manifolds, substantially as specified.

5. In a steam-boiler, the return-fine horizontal water-drums, having a common steamdrum, a common water circulation, and a common smoke-pipe, the vertical water-tubes, inclosing the combustion chambers of said boiler, the lateral of said vertical tubes having an inward swell close to the water-drums, and over said chamber, and the rear said vertical tubes having an inward extension over the uptakes, the upper and lower longitudinal and cross manifolds, with which said tubes are'connected at their extremities, and the downflow-pipes connecting the lower forward portions of the water-drums with said lower manifolds, substantially as specified.

In testimony whereof I affix my signature in presence of two witnesses.

ALFRED C. EVANS.

Witnesses GEORGE M.4 ANDERSON, Jos. GREGORY.

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